<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			//circle.js文件
			export function area(radius){
				return Math.PI * radius * radius;
			}
			export function circumference(radius){
				return 2 * Math.PI * radius;
			}
					......
					
			//index.html文件
			<script type = "module">
			// 必须加type = "module"
			// 需同源
			// 部分加载
			import{area, circumference} from './circle.js';
			
			console.log('圆面积: ' + area(4));
			console.log('圆周长: ' + circumference(14));
			
			//整体加载
			import * as circle from './circle.js';
			
			console.log('圆面积: ' + circle area(4));
			console.log('圆周长: '+ circle.circumference(14));
			</script>
		</script>
	</body>
</html>
